Earlier quoted context omitted.
How about Sublime Text? That’s mostly my use case. Opening giant files that VSCode can’t, Ctrl-F a regex expression, selecting all matches, and pasting them into a new buffer. Like a visual interactive grep. Sublime handles big files pretty well but I’ve still managed to make it chug on occasion.
In Sublime 4 thread people were talking about UltraEdit, it is even probably the reason for this submission. Anyway, there people mentioned UltraEdit has a "disk edit" mode, where it DOESN'T dump the file on the ram, and instead displays a chunk of whatever is on t he disk, this is how it allows the editing of gigantic text files, theoretically you can edit files of any size, maybe even infinite size.
and how search/replace worked out?